Hey, danke Lemmy!!
Das hat funktioniert mit opener. Super!!!
Hier der fertige Code für das Popupfenster:
<html>
<head>
<title>Metatags</title>
<script>
function ShowMetaTag() {
var MetaTagList = opener.document.all.tags("meta");
var ListLength = MetaTagList.length;
var MetaName;
var MetaContent;
document.write ("<b>URL: </b>" + opener.document.URL + "<BR>");
document.write ("<b>Titulo: </b>" + opener.document.title + "<BR>");
for (i = 0; i < ListLength; i++) {
MetaName = MetaTagList[i].name;
if (MetaTagList[i].content.length > 0)
MetaContent = MetaTagList[i].content;
else
MetaContent = "no datos";
document.write ("<b>" + MetaName + " : </b>"+ MetaContent + "<BR>");
}
}
</script>
</head>
<body>
<script>
var x = ShowMetaTag();
</script>
</body>
</html>